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SHEDD L WORCESTER.

"Chimney Cap.

Patented"l July 3, l1866.

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UNITED STATES PATENT OFFICE..

J. HERBERT SHEDD AND BENJAMIN WORCESTER, OF WALTHAM, MASS.

CHIMNEY-CAP.

Specification forming part of Letters Patent No. 56,109, dated July 3, 1866.l

To all whom it may concern.-

Be it known that we, J. HERBERT SHEDD and BENJ. WORCESTER, both of Waltham, in the State of Massachusetts, have invented a new and useful Improvement in Chimney- Gaps; and We do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawing, and to the letters of reference marked thereon.

The nature of our invention consists in protecting the horizontal opening 'of a cylindrical covered chimney-top with a movable shield or guard in such a manner that the wind will move the shield to cover and close the open` ing on the Windward side, while the leeward side is left open.

The construction and operation of the cap, as represented in the drawing, are as follows:

A is the top of a chimney. B is the Vhollow base of our cap, made by preference of castiron. C is a horizontal cover, supported over `the flue by the standards D D, which rest on B, not very unlike a common form of cap.

E is a movable ring, of thin metal, applied by us, which is horizon tal when free, and then surrounds the opening between B and C at such a distance as to leave a free space for the passage of the contents of the Hue around the bottom L of the cover C.

E is a spider, of crossed metal bars, attached to the ring E, and supporting it by means of the rod Gr and ball I on the spider H, inside the flue. The spider H is attached to the sides of the flue in the base B.

I is a ball on the rod Gr, playing in the socket of the spider H, which socket, by preference,

we make of glass.

K, against which the top of the ring E strikes when blown to one side.

M is a horizontal projection on C, a little above the bottom L, with a curved surface above of such form as to turn or deiiect over the openings the wind that strikes against the under side of C.

N N are tunnel-shaped openings through the ring E, through which the Wind may drive small jets to facilitate the discharge of the contents ofthe flue.

The operation of the cap thus represented is as follows: When there is no wind the ring E remains horizontal and the smoke or other contents of the flue escape upward on all sides between the ring and the cover C. When the wind blows, from whatever quarter, as shown by the arrow, the ring E is moved by it till it touches L, and thus closes the opening effectually tothe Windward side, while the opening` on the opposite side is increased. A partial vacuum being then formed by the parting of the wind by the shield or ring, an upward draft is created in the jiu-e. This effect is increased by the jets through N N.

In this description we have set forth one form of the shield we` use and one Inode of supporting it; but we do not wish to limit ourselves to this particular forni of shield or to this inode of supporting it, for the shield may be made of various forms and be supported in various ways, as by suspension or by resting free on a horizontal surface, or it may be made to lit close about the opening, with one open side, and rest on its edge or on a pivot in the middle, s0 as to revolve lby the action of the wind and keep its close side to windward, in all such ways having substantially the same effect as the shield or ring above described.

We do not claim the horizontal opening to r l. The combination of a fixed cover above a flue with a movable shield so adjusted as to be made by the force of the wind to close the opening between the flue and the cover on the Windward side, While the leeward side N N, in combination with the base B and cap is left open. C, substantially as described.

2. The construction and arrangement of the J. HERBERT SHEDD. base B, vWith its spherical surface K, and of BENJ. WORCESTER. the cap C, with its curved under surface and Witnesses: projection M, substantially as described. R. R. BISHOP,

3. The ring E, with the tunnel-shaped jets L. S. DARNEY. 

